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    <h1>web前端开发</h1>
    <h2>HTML</h2>
    <p>超文体标记语言，用于构建网页结构</p>
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    <h2>CSS</h2>
    <p>层叠样式表，用于构建网页结构</p>
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    <h2>JS</h2>
    <p>javascript,脚本语言，用于构建网页行为</p>
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